User's Manual

LTE Module Series
EC21 Hardware Design
EC21_Hardware_Design Confidential / Released 58 / 94
4 GNSS Receiver
4.1. General Description
EC21 includes a fully integrated global navigation satellite system solution that supports Gen8C-Liteof
Qualcomm (GPS, GLONASS, BeiDou, Galileo and QZSS).
EC21 supports standard NMEA-0183 protocol, and outputs NMEA sentences at 1Hz data update ratevia
USB interface by default.
By default, EC21 GNSS engine is switched off. It has to be switched on via AT command. For more
details about GNSS engine technology and configurations, please refer to document [3].
4.2. GNSS Performance
The following table shows the GNSS performance of EC21.
Table 24: GNSS Performance
Parameter Description Conditions Typ. Unit
Sensitivity
(GNSS)
Cold start Autonomous -146 dBm
Reacquisition Autonomous -157 dBm
Tracking Autonomous -157 dBm
TTFF
(GNSS)
Cold start
@open sky
Autonomous 35 s
XTRA enabled 18 s
Warm start
@open sky
Autonomous 26 s
XTRA enabled 2.2 s